Abstract
Pectin methylesterase (PME) is known to have important roles in pollen development and pollen tube growth. As pivotal regulatory factors in PME activity modulation, PME inhibitors (PMEIs) are thought to be key regulators of cell wall stability at the tip of the pollen tube. We report on the cloning and characterization of a novel B. oleracea PMEI gene, BoPMEI1. Heterologously expressed BoPMEI1 showed PMEI activity. RT-PCR studies of different tissues and promoter-GUS fusions confirmed that BoPMEI1 was specifically expressed in mature pollen grains and pollen tubes. Based on in vivo transient assays, we found that BoPMEI1 appears to be largely localized to the plasma membrane. Transgenic Arabidopsis plants expressing antisense BoPMEI1 under the control of the CaMV 35S promoter suppressed the expression of the orthologous gene At1g10770, which led to partial male sterility and decreased seed set by inhibition of pollen tube growth. Our study demonstrates the involvement of BoPMEI1 in pollen tube growth.
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Abbreviations
- PME:
-
Pectin methylesterase
- PMEI:
-
Pectin methylesterase inhibitor
- RT-PCR:
-
Reverse transcriptase polymerase chain reaction
- CaMV:
-
35S Cauliflower mosaic virus 35S
- GUS :
-
Beta-glucuronidase
- cDNA-AFLP:
-
cDNA-amplified fragment length polymorphism
- ORF:
-
Open reading frame
- kDa:
-
Kilometer Dalton
- nt:
-
Nucleotide
- aa:
-
Amino acid
- IPTG:
-
Isopropyl β-D-1-thiogalactopyranoside
- Kan:
-
Kanamycin
- GFP:
-
Green-fluorescent protein
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Acknowledgments
This research was conducted at the Key Opening Laboratory of Vegetable Genetics and Physiology funded by the Chinese Ministry of Agriculture and the Sino-Dutch Joint Plant Genome Analysis Laboratory at the Institute of Vegetables and Flowers (CAAS). The work was supported by National Natural Science Foundation projects 30370981, 30471188 and 30400298.
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Zhang, G.Y., Feng, J., Wu, J. et al. BoPMEI1, a pollen-specific pectin methylesterase inhibitor, has an essential role in pollen tube growth. Planta 231, 1323–1334 (2010). https://doi.org/10.1007/s00425-010-1136-7
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DOI: https://doi.org/10.1007/s00425-010-1136-7